Drag arrangement for the bobbins of spinning, doubling, and like machines



I March 31, 1931.

H. scH IDER DRAG ARRANGEMENT FOR BOBBINS OF SPINNING, DOUBLI AND LIKEMACHINES 30.

F1 June 1928 Patented Mar. 31, 1931 UNITED: STA ES PATENT OFFICE HENRYSCHNEIDER, F LENZBURG, S'WITZ ERLAND DRAG ARRANGEMENT FOR THE screws orSPiNNING, nonnmne, AND LIKE MACHINES Application filed June 30, 1928,Serial No. 289,540, and in Germany July 5, 1927.

In spinning and doubling machines use is made, as is already known, ofpartly automatically braked bobbins, in which consequently special brakecords and brake weights are dispensed with. Now the latter arrangementpossesses the disadvantage that the cords are subject to wear and tear,and necessitate special attention, particularly when changing thebobbins, so that the use of automatic bobbin changing devices gives riseto difiiculties, or is even impossible. On the other hand the use ofbrake cords has the advantage that the braking can be increased as thebobbin filling increases; as,

otherwise, if the braking were to remain the same then the thread pullwould be diminished because, with an increase in the winding diameter,the thread pulling the bobbin works with a greater leverage.

According to the present invention I obtain also with an automaticbobbin braking an adaptation of the brake momentum to the changingbobbin diameter due to the fact that fibrous materials are used forforming the braking surfaces, such as cotton or asbestos or a mixture ofsuch materials, which are made up into a tissue or fabric either aloneor in combination with metal wire, in particular brass wire. The fibrousmaterials may be saturated with a binding medium, or they may becompressed, or both saturated and compressed.

Materials of this kind have for a long time past been successfully usedfor power brakes,

36 and in such cases use is made of the property that at a greatspecific pressure (i-2kg/ c111 they possess a high friction coefiicient.In the present case less use is made oi this, greater utilization beingmade in particular rather 40 of the property that, at low and mediumloads (for example up to about 0.9 kg/cm the friction coefficientincreases with the specific pressure. Consequently a substantialincrease in the braking moment is effected by the increase in weight dueto the increas ing filling of bobbin (in spite of the relatively greatweight of the brake plate, thehollow shaft and the body of the bobbin),andas on the other hand, with the increasing filling,

the threadpull acting in opposition to the the production,

brake moment engages with a greater leverage, consequently this pull,which is of decisive importance for the good quality of can bemaintained constant or can even be increased. I :35

The latter is of advantage inasmuch as the winding angle of the threadpull or of the thread guide, and the consequent increase in the frictionand reduction of the pull, can be compensated for. Consequently the tothread pull can be maintained constant even up to the point at which thesliver leaves the feed cylinders, whereby the greatest possible strengthof thethread produced is obtained.

in the accompanying drawings a few con structional examples of theinvention are given, which embody still further improvements, tobereferred to later "indetail.

In these drawings: I

Fig. 1 represents a central vertical section through a bobbin and brake.

Fig. 2 represents a similar section of a modified form ofbralre, and"Fig. 3 represents a bottom view ofthe brake disc of Fig. 1. I i InFigures 1 and 2 are shown in section two bobbin bearings for. automaticbraking. a is the bobbin rail with the dead spindle b, a is thebrakeplate to which is fixed a hollow shaft (Z which carries the bobbin 6. Tothe I under side of the brake plate 0 is attached thebralring material7. The latter may have the form of a complete ring (Figure 2), or, asshown in Fig. 1, consists of a plurality of circularly arrangedsegments. This latter 55 feature jisshown more clearlyin Figure 3 whichalso shows the brake plate 0 in bottom view. Of course the brakematerialmay also be fastened to the bobbin rail a. *The arrangement shown,however, is more advantageous asthen by a simple exchange of the brakeplate for one of a different weight and with differently dimensionedbrake surfaces, the spinning machine can be used for the manui iactureof a different count of yarn. Itris essential that the new brakingmaterial shall enable work to be done with greater brake pressures thanheretofore. The consequence of this is, of course, that more work 139will be converted into heat. The carrying off of this heat from thefrictional surface is facilitated by dividing the brake ring intosegments, as in this case an extraordinary effective eddy currentcooling takes place, which acts both upon the bobbin rail and inparticular upon the brake plate. This cooling effect can be stillfurther increased by means of borings 9 made close to the spindle,through which air is drawn in from below through the bobbin rail, and isthen forced radially towards the outside. For a solid friction ring f,as shownin Figure 2, in addition to the borings 9 close to the spindle,borings h may also be provided close to the inner edge of the frictionring f and, if necessary, ribs 2' may be applied to the underside of thebrake plate. The air cooling then works in a similar manner to a.centrifugal pump. Through the borings 9 air is" aspired, and forced outthrough the borings h. In this arrangement radiation of the heat intothe air at the periphery of the bobbin does not occur to an appreciableextent. Considerable radiation may however be brought about if, as shownin Figure 2, a disc-shaped edge is is provided atthe brake plate 0,which sets the surrounding air in motion and radiates large quantitiesof heat to the air moved by it.

In the case of cooling, which does not act upon the friction surfacedirectly as in the arrangement according to Figures 1 and 3,

' it is of great advantage to use fibrous material with embedded metalwire, because this combination, a bobbin rail, a spindle mountedvertically upon said rail, a bobbin on said spindle, braking materialarranged between said bobbin and said rail within an annulus around thebobbin axis, means for supplying air to the space within said annulus,and means for ventilating said space by the rotation of said bobbin.

In testimony whereof I aiiix my signature.

- HEN-RY SCHNEIDER.

wire rapidly transmits the heat generated I through the brake materialto the brake plate, and in this way the temperature of the frictionsurface is reduced.

The transmission of air effected by the brake plate can finally also beutilized for aspiring air, through an axial boring in the dead spindlewhich is in 1 communication through radial borings at its foot with thehollow space beneath the brake late, or through longitudinal grooves ont e outer surface of the dead spindle b or on the inner surface of thehollow shaft d, and in this way to cool the spindle. 1

What I claim is: v v

1. In spinning, doubling or similar machines with automatically brakedbobbins, in combination, a bobbin rail, a spindle mounted verticallyupon said rail, a bobbin on said spindle, braking members locatedbetween said bobbin and said bobbin rail, said braking membersconslsting of a plurality of separate ring segments arranged in acircle, and borings serving as air ducts, terj minating within thecircle formed by said segments, whereby said segments act as vanes toconvey air through the circular space within said segments. 7

2. In spinning, doubling or similar machinesw-ith automatically brakedbobbins, in

